Question

y²-9 factorise completely​

Answer 1

Step-by-step explanation:

{y}^{2} - 9y

2

−9

{y}^{2} - {3}^{2}y

2

−3

2

using \: identity \: {a}^{2} - {b}^{2} = (a + b)(a - b)usingidentitya

2

−b

2

=(a+b)(a−b)

(y + 3)(y - 3)(y+3)(y−3)

y = + 3 \: and - 3y=+3and−3

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Answer 2

Answer:

( y - 3 ) ( y + 3 )

Step-by-step explanation:

y² - 9

= y² - 3²

Formula : -

a² - b² = ( a + b ) ( a - b )

Here,

a = y

b = 3

y² - 3² = ( y - 3 ) ( y + 3 )